View Compilation Error

0_0_39763598_32634.cpp:2:9: error: cannot declare '::main' to be a global variable
    2 |     int main{
      |         ^~~~
0_0_39763598_32634.cpp:3:9: error: expected primary-expression before 'int'
    3 |         int a=1,b=5,c=10,d=20;
      |         ^~~
0_0_39763598_32634.cpp:3:9: error: expected '}' before 'int'
0_0_39763598_32634.cpp:2:13: note: to match this '{'
    2 |     int main{
      |             ^
0_0_39763598_32634.cpp:4:15: error: expected constructor, destructor, or type conversion before '(' token
    4 |         printf("%d\n%d",a+b,c+d);
      |               ^
0_0_39763598_32634.cpp:5:9: error: expected unqualified-id before 'return'
    5 |         return 0;
      |         ^~~~~~
0_0_39763598_32634.cpp:6:1: error: expected declaration before '}' token
    6 | }
      | ^